Validation of Structural Grounds for Anomalous Molecular Mobility in Ionic Liquid Glasses

Validation of Structural Grounds for Anomalous Molecular Mobility in Ionic Liquid Glasses Full article

Journal

Molecules
ISSN: 1420-3049

Output data

Year: 2021, Volume: 26, Number: 19, Article number : 5828, Pages count : 10 DOI: 10.3390/molecules26195828

Tags

ionic liquids, glasses, molecular mobility, spin probe, deuteration effect, nanostructure

Authors

Ivanov Mikhail Yu. ¹ , Prikhod'ko Sergey A. ² , Bakulina Olga D. ¹ , Kiryutin Alexey S. ¹ , Adonin Nikolay Yu. ² , Fedin Matvey V. ¹

Affiliations

1	International Tomography Center SB RAS, Institutskaya Street 3a, 630090 Novosibirsk, Russia;
2	Boreskov Institute of Catalysis SB RAS, Lavrentiev Avenue 5, 630090 Novosibirsk, Russia

Ionic liquid (IL) glasses have recently drawn much interest as unusual media with unique physicochemical properties. In particular, anomalous suppression of molecular mobility in imidazolium IL glasses vs. increasing temperature was evidenced by pulse Electron Paramagnetic Resonance (EPR) spectroscopy. Although such behavior has been proven to originate from dynamics of alkyl chains of IL cations, the role of electron spin relaxation induced by surrounding protons still remains unclear. In this work we synthesized two deuterated imidazolium-based ILs to reduce electron–nuclear couplings between radical probe and alkyl chains of IL, and investigated molecular mobility in these glasses. The obtained trends were found closely similar for deuterated and protonated analogs, thus excluding the relaxation-induced artifacts and reliably demonstrating structural grounds of the observed anomalies in heterogeneous IL glasses.

Ivanov M.Y. , Prikhod'ko S.A. , Bakulina O.D. , Kiryutin A.S. , Adonin N.Y. , Fedin M.V.
Validation of Structural Grounds for Anomalous Molecular Mobility in Ionic Liquid Glasses
Molecules. 2021. V.26. N19. 5828 :1-10. DOI: 10.3390/molecules26195828 WOS OpenAlex

Submitted:	Aug 18, 2021
Accepted:	Sep 23, 2021
Published online:	Sep 26, 2021

Web of science:	WOS:000760296600001
OpenAlex:	W3202750823

DB	Citing
OpenAlex	11